This is interesting. I guess it's possible that all plant parts use co2 here's why. All plant cells contain cloroplasts a key ingredient in cloroplast formation is carbon. This is probably why KC says what he says. Sheist that's perfectly Ok to do that but not practical for large grows also a blast of co2 for a short period of time has been shown ineffective for overall plant production. Plants need elevated co2 levels for extended periods during the daylight cycle to show marked and measurable improvment.

Herbus